Furnace for steam-boilers



, (No Model.)

F. BARCLAY.

FURNACE FOR STEAM BOILERS.

No. 486,923. Pa-tented Nov. 29, 1892.

MR. ax A I O nms PETERS 1:0 mom-Arma WASHINGTON n c wall removed to more fully show the internal 1 NITE STATES FRANK BARCLAY, OF BEATRICE, NEBRASKA.

FURNACE FOR 8 TEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 486,923, dated November 29,1892.

Application filed July 5, 1892- Serial No. 438.987- (No model.)

To all whom it may concern.-

Be it known that I, FRANK BARCLAY, a citizen of the United States, residing at Beatrice, in the county of Gage and State of Nebraska, have invented certain new and useful Improvements inFurnaces for Steam-Boilers, of which the following is a specification.

My invention relates to furnaces for steamboilers; and the invention consists in certain novel features of construction, as hereinafter more fully described.

Figure 1 is a side elevation with the side construction. Fig. 2 is a vertical transverse section on the line 00 a: of Fig. 1.

My invention relates to that class of furnaces in which a double fuel-chamber is used, the fuel first being coked in the front chamber and then consumed in the rear or combustion chamber; and the object of my invention is to simplify and cheapen the construction and to consume the smoke and gases by the introduction of heated air to the combustion-chamber in small jets, and at the proper point to insure its thorough admixture with the hot gases and smoke. i

In the accompanying drawings, B represents an ordinary tubular boiler set in brickwork A with a bridge -wall D in the usual manner. The fuel-chamber, however, is divided into two chambers, a front or coking chamber E and a rear or combustion chamber F, as shown in Fig. 1, each chamber being provided with a set of grate-bars G, the adjoining or abutting ends of the two sets being supported by a cross-bar O, which has a bearing at its ends in the side walls and which may also have a central support, if necessary. I provide a water box or heater 0 of the proper length to reach across the furnace-chamber and rest upon the side walls, as shown more clearly in Fig. 1, it being connected to the boiler B by pipes 19 and r, as shown, to permita free circulation of the wafor to and from the boiler. This may be made of cast or wrought iron, as preferred, and which may be of any form in cross-section that will enable it to support the hollow partition of fire-brick above and which separates the front and rear chambers. On this waterbox I place a row of solid fire-brick a, which extends all the way across the chamber, they being located along the front of the box, and along the rear edge of the box I place another row of fire-brick b, which are perforated with a series of small holes, as shown in Fig. 2. The water-box is made of such a width that when these two rows of fire-brick are set thereon there will be a space or chamber 6 left between the two rows, as shown clearly in Fig. 1, this chamber being closed at top by brick laid transversely upon the rows of brick a and b, as shown in Fig. 1, these horizontal brick forming the floor or bottom of the uptake at the front end of the boiler and which connects with the smoke-stack S in the usual manner. As shown in Fig. 1, these fire-brick extend over the entire top of the front chamber E, thereby forming a'surface which becomes highly heated and which by the heat radiated therefrom largely assists in coking the fuel and forming gases in the front chamber, and which gases passing under the partition,which is also highly heated, are delivered into the combustion-chamber heated to the point of ignition, or practically so, in the best possible condition to unite with the oxygen of the heated air, and thus secure perfect combustion in the rear or combustion chamber. This air-chamber 6 extends entirely across the furnace-chamber and is provided at its ends with a'hinged or sliding door (1 to regulate the admission of air from the outside, as shown in Fig. 2. It will be seen that by this construction the water-box 0 forms a support for the fire-brick above it, and thatit,with the two rowsof brick a and b, with the intervening air-chamber, forms the partition between the front and rear fuel-chambers E and F. This partition thus constructed extends about two-thirds of the distance downward toward the grate-bars G, thus leaving an opening or throat T under it, and which connects the two fuel-chambers, as shown in Figs. 1 and 2.

The water-box, as a support for the hollow partition, which also constitutes the air-heating chamber, isimportant for several reasons.

In the first place if this air-chamber were supported by iron bars they wouldsoon .be destroyed by the intense heat and if sup ported by an arch the lower surface of the arch expanding more than the portions above would soon cause the disintegration or breaking up of the partition-wall and air-chamber of the heated air, which is introduced at a.

point where it instantly mingles with the gases as they enter the combustion-chamber.

The front fuel-chamber E is provided with "a door I for the admission of the fuel, and below that with a smaller door 25 for the insertion of a poker or implement for shoving the coked fuel from the front chamber back into the combustion-chamber, as occasion may re The ash-pit P will also be provided' quire. with the usual doors for regulating the'draft, as may be necessary.

The operation of the apparatus is as follows: A fire is started in both chambers E and F, and after it is fairly started the front chamher is partly filled with coal and the doors closed, the fuel therein becoming coked or roasted. From time to time this roasted or coked fuel is shoved back through the space or throat T into the combustion-chamber F, where it is burned. While this is going on air from the opposite sides enters the air-chamber e, where it is heated by contact with the highly-heated fire-brick a and b, and from thence passes in small jets through the perforations in the bricks band is delivered justover the-burning fuel in the combustion-chamberF, where it is intimately mingled with the hot gases arising from the same, thereby causing a perfect combustion of thegases and smoke. By these means I not only secure perfect combustion, but also consume the -smoke,

thereby avoidinga great nuisance, especially when steam-boilers are used in cities or densely-settled. neighborhoods. By roasting or coking the fuel before burning it I also secure greater economy of fuel and a more intense heat. By arranging the coking-chamchamber e, it is consumed and thus utilized to *a far greater extent than is possible in the ordinary single-chamber furnace.

The construction is exceedingly simple, and by a very slight alteration of the ordinary boiler-furnaces my invention can readily be applied to them.

While I have shown my improvements as applied to a steam-boiler, it is obvious that they may be applied to furnaces used for other purposes also.

I am aware that it has been proposed to combine a coking and a combustion chamber in a furnace and that various plans have been devised for delivering heated air to the front chamber and also in some cases to the combustion-chamber, and therefore I do not claim either of these broadly; but I am not aware that anyone has ever before constructed a furnace on my plan, and, therefore,-

VVhat I claim is 1. The combination,in a furnace, of afront coking-chamber and a rear combustion-chan1- her with a transverse air-chamber supported by a water-box, the rear wall'of said air-chamber being provided with a series of perforations for delivering heated air to the combustion-chamber, substantially as show-n and described.

2. The combination,in a furnace, of a front coking-chamber, a rear combustion-chamber, and a transverse water-box with a transverse air-chamber over the same, said air-chamber having its front wall solid and its :rear Wall provided with a series of perforations, all arranged to operate substantially as and for the purpose set forth.

3. In a furnace, the combination of affront coking-chamberand a rear combustion-chamber, the two being separated by a pendent partition having an opening underneath it, through which the gases produced in t'he'cokin g-chamber are compelled to pass through the incandescent fuel, with an air-heating duct or chamber located in said pendent partition and having its rear wall provided with a series of perforations through which the heated air is delivered in a large number of small jets, substantially as and for the purpose set forth.

In witness whereof I hereunto set my hand in the presence of two witnesses.

FRANK BARCLAY. Witnesses:

R. W. GRANT, S. 0. SMITH. 

